Most probably a track setup problem. First you need to select an existing track from the library, or create a new one. The traps in the track need to be facing right way (they are unidirectional by default) and there needs to either one "Start/Finish" trap, or one "Start" and one "Finish".
You can share the session to me by email to tracks(at)racechrono.com and I will take a look what is wrong.
Unfortunately the file got corrupted again. Possibly due to email client or servers between. Can you share it in Google Drive or DropBox, so it doesn't get corrupted?
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You can share the session to me by email to tracks(at)racechrono.com and I will take a look what is wrong.